I have been hunting Coues in Az since '83. I used to be a walk around hunter hoping to kick out a buck to be shot. Now days I find a good vantage point and sit for the entire morning or evening and glass with 15 x 60s on a tripod.
If you are a glassing type hunter why sweat the weight of the rifle? A moderate hike to the sitting area is all that is needed.
I have been on a quest for THE coues rifle too. I used the 284 win and the 7 Rem mag with a 120 nos bt in the early days. Then I learned about higher BC bullets and turrets. It changed everything.
As time went on my shooting partner and I have evolved. Hyper velocity is not needed, a steady consistent shot to shot outcome is the way to go. I agree with much of what was said pertaining to the 308 or 300 WSM. BUT I'd be inclined to go with a 7 WSM or similar.
Great link on 7 mms for long range here: 7mm Cartridge Guide
I am in the process of building, of all things, a 30" 7 rem mag twisted and throated for the 180 Berger VLD. It is not going to be a barn burner and recoil should be relatively light in a 12 lb
After all the above ranting....I also like what Kirby said. I do have a 300 RUM and 7 STW and have had a 7 RUM. All are VERY impressive in their performances. I am certain I'll again build a 7 RUM in a heavy package but with a custom chamber and a much longer barrel than the 26" sendaro I had. FYI my shooting friend is building a 7 STW with same configuration as my 7 rem mag....30" barrel twisted for the 180 VLD etc. We will learn plenty when we compare these two rifles.
This is THE site to glean all sorts of knowledge. Best search feature I have used. I did some research on which picatinny rail and rings. Man that was great! So do some searching here and read threads going back several years. Many questions will be answered and undoubtedly it will foster new ones.
Are you an Az resident? Where are you?